JPH0231997B2 - - Google Patents

Description

[Detailed description of the invention]

[Industrial Field of Application] The present invention relates to a method for forming seams in bonded fabric. More specifically, two or three layers of elastic sheets such as polyurethane rubber are laminated in a sandwich pattern on the front or back side of a knitted fabric mainly made of synthetic fibers, or between a plurality of knitted fabrics. The present invention relates to a novel method for forming seams in a bonded fabric having, for example, the multilayer structure described above. [Prior art] Recently, synthetic rubber has been added to one side of synthetic fiber knitted fabrics.
A three-layer waterproof bonded fabric has been developed, which is made by laminating or coating a sheet of elastic material such as synthetic resin, and laminating a knitted fabric made of synthetic fiber as a lining on the other side, and is now used in ski wear for competitions. It is used as a material for ski pants, sports raincoats, mountaineering raincoats, fishing clothes, etc. This material is also available in two-layered, unlined versions. The elastic sheet material of the bonded fabric has only a waterproof function or both waterproof and moisture permeable functions (for example, a microporous structure). In addition, ski wear for competitions such as jumps and alpine ski wear has been developed that has low breathability close to the lower limit of the FIS standard and has low windproof and air resistance values. However, these bonded fabrics are
Since most of these materials are used for winter sports, the outer material or lining is necessarily thick. Furthermore, since an elastic sheet-like material is interposed, resulting in a two-layer or three-layer structure, many have a thickness of 1.5 to 2.5 mm. Therefore, when these bonded fabrics are sewn using conventional methods, the following problems occur. That is, when worn, it is difficult to create a clean silhouette and the garment becomes uneven. In addition, air resistance is large, which affects records competing for 1/100 seconds.
On the other hand, in the case of fabrics intended for waterproofing, conventional seam sealing tape has thick seam allowances, the tape is easy to peel off due to its rubber-like repellency, and the adhesive resin of the tape is difficult to penetrate through the thick lining. Therefore, it is difficult to expect sufficient waterproofing effect. In addition, Figure 9 shows the seam structure sewn using the conventional method, but competition ski wear is generally made of thick fabric, which causes problems such as loose seam allowances and increased air resistance. be. Additionally, this seam construction allows fabric
Fa, Fb seam 8 hole and fabric Fa, Fb
Since water infiltrates from both of the gaps 9, there is a problem in that water infiltrates into the clothes in a short period of time. Moreover, FIG. 10 shows another example of the conventional seam structure,
Overlock seams 10 are formed by overlocking the seam allowances of fabrics Fa and Fb using an overlock sewing machine, but as in the case of FIG. 9, there are problems in that the seam allowances become loose and air resistance increases. Japanese Utility Model Application Publication No. 50-34501 discloses improvements in the joints of fabrics for the paper manufacturing industry, such as dryer felt, dryer canvas, and belts for coating machines, to facilitate the work of attaching them to paper machines. In order to improve strength and durability, we butt both ends of the edged fabric together, apply a zigzag sewing machine stitch across both ends over the entire width of the abutted part, and then stitch stitches between the zigzag left and right amplitude stitches. An endless joint formed by forming a plurality of intermediate seams has been proposed. However, according to this joining method, at the joined part of the fabrics, the parts other than the seams are simply butted together and are not restrained in any way. Therefore, if stress is applied perpendicularly to the seam direction, gaps can easily form in the butted parts of the fabrics. This will result in
For this reason, when the above-mentioned method for joining industrial fabrics is applied to the clothing application of the present invention, (a) the two pieces of fabric are likely to shift during sewing, generate sewing wrinkles, and be easily deformed; or (b) ) Two pieces of fabric tend to overlap during sewing, resulting in uneven thickness; (c) Cannot be applied only to garments with complex curved parts; (d) Edges of butted parts tend to fray. Since it would cause inconvenience, it could not be applied at all. [Purpose of the Invention] The present invention was made to solve the above-mentioned conventional problems, and it combines fusing and sewing, as well as sealing, to eliminate water from between two fabrics by fusing. This bonded fabric prevents water from seeping in and makes it easier to sew, has almost no seam allowance to eliminate loose seam allowances, and has a seam seal that makes it even more waterproof. The object of the present invention is to provide a seam forming method. [Structure of the Invention] The method for forming seams in a bonded fabric of the present invention, which achieves the above-mentioned object, is a method for forming seams in a bonded fabric in which an elastic sheet-like material is laminated on a knitted fabric mainly made of synthetic fibers.
Two layers of bonded fabric having a multilayer structure of three or more layers are overlapped and cut, and at the same time, the upper and lower fabrics are fusion-bonded, and then the fusion-bonded portion is used as a boundary. The present invention is characterized by forming a seam so as to span fabrics, and the present invention also involves fixing a waterproof tape on the seam after or simultaneously with the formation of the seam, and After formation, it is desirable to apply a resin to the seam portion that is capable of adhering to both the fabric and the sewing thread. [Embodiments of the Invention] Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. As the bonded fabric used in the present invention, for example, the following can be targeted. A. A waterproof/breathable fabric made by coating the back side of a synthetic fiber knitted fabric with a microporous polyurethane film. B. A regular lining or pile fabric pasted on the back side of the fabric in A above. C. A smooth surface. A fabric with a four-layer structure consisting of a polyurethane resin coated on the back side of a tricot knitted fabric that has been processed to control airflow, a urethane foam, and a lining. In the cutting and fusion bonding process described later, when stacking two sheets, for example, one bonded fabric has a two-layer structure, and the other bonded fabric has a three-layer structure. Alternatively, it is also possible to use a combination of different bonded fabrics, such as a four-layer structure. To explain the method of forming seams in bonded fabric, FIGS. 1 to 6 are perspective views showing respective examples of forming seams by implementing the present invention. First, as shown in Figures 1 and 2, two bonded fabrics Fa and Fb are stacked face-to-face.
The ends are cut and fused together at the same time using the wheel 1 of the ultrasonic welder (Fig. 1) or the blade 2 of the high-frequency welder (Fig. 2), and these fabrics Fa and Fb are joined as in the fused part 3. . In addition, in Figure 1, an ultrasonic welder with wheel 1 attached is used, and in Figure 2, a high frequency welder with blade 2 attached is used, but in addition, the wheel or blade can be heated using an external heating method. You can also use the Since the outer material or lining material constituting the bonded fabrics Fa and Fb is a knitted fabric mainly made of synthetic fibers, it is heat-fused by the above treatment. Also,
The front or back surfaces of the fabrics Fa and Fb, or the intermediate elastic sheet material such as synthetic rubber or synthetic resin, are also heat-sealed in the same manner. The product made in this way is shown in Figure 3, with almost no seam allowance.
The fabrics Fa and Fb are joined by a welded part 3. However, even in this state,
Although it is waterproof and has no seams, the fused portion 3 is only a small portion of the knitted fabric and elastic sheet forming the fabrics Fa and Fb that are fused together. Therefore, as it is, the strength is weak and the durability as a product is insufficient. Therefore, next, a seam is formed so as to span both fabrics Fa and Fb with this fused portion 3 as a boundary. That is, Fig. 4 shows the case where zigzag stitch 4 is formed, Fig. 5 shows the case where flat seam 5 is formed, and 6th stitch
The figure shows an example of forming rolling seams 6 using a carp seamer sewing machine used for sewing fur or socks.
They can be selected as appropriate depending on the properties of Fa and Fb, product usage, etc. In the above seam formation, the staggered seam 4 in Fig. 4 and the flat seam 5 in Fig. 5 are formed by pure butt stitching without seam allowance, whereas in the case of Fig. 6, The seam is sewn with a seam allowance of about 2 to 3 mm, but since the seam is a rolled seam with a loop structure, there is plenty of room, so the result is a sewn product with almost no seam allowance. In addition, it is preferable to form the seams after expanding the fabrics Fa and Fb around the fused portion 3, but it is preferable to form the seams by selecting the seams (for example, the rolled seams shown in Fig. 6). Accordingly, after forming the seam, it is also possible to expand the seam around the fused portion 3. The seam-formed product of the above example obtained in this way has fabrics Fa, Fb
It is possible to prevent water from entering between the seams, and since there is almost no seam allowance, it is possible to eliminate loose seam allowances. That is, compared to the conventional seam forming products shown in FIG. 9 and FIG. Become. In addition, in the conventional seam forming product shown in FIG. 9, water infiltrates from both the hole in the seam 8 of the fabrics Fa and Fb and the gap 9 in the fabrics Fa and Fb, but in the seam forming product of the embodiment of the invention described above, , there is no water intrusion between fabrics Fa and Fb, but only through a small hole in the seam.
With clothing that does not come into direct contact with water, such as ski wear, even if snow does adhere to the clothing, it does not seep into the clothing in a short period of time. In addition, since the seam forming product of the embodiment of the present invention has seams formed across fabrics Fa and Fb, the seam strength is comparable to that of the conventional seam forming product (for example, 45 kg/5 cm above) is obtained. The main structure of the bonded fabric seam forming method of the present invention is as described above, but by further considering the following points, more significant effects can be obtained. Firstly, after or at the same time as the seam is formed, a waterproof tape is fixed over the seam, which can also reduce water intrusion through the small holes in the seam. . In addition, in this embodiment, for example, the seam waterproof tape has a particularly large amount of adhesive resin (for example, 100 to 150μ in thickness) on the seam of the embodiment shown in FIGS. 4 to 6, and has a melt viscosity of This can be done by adhering a tape made of a resin with low viscosity. Second, after the seam is formed, a resin capable of adhering to both the fabric and the sewing thread is applied to the seam portion, thereby achieving almost the same effect as in the case of the adhesive tape. Note that this aspect can be implemented by, for example, infiltrating the seam portion with silicone resin, urethane resin, or the like. Furthermore, in these embodiments, if a water-repellent and heat-adhesive thread is used as the sewing thread, the thread repels the intrusion of external water and further closes the seam holes, resulting in an even more pronounced waterproof effect. Can be done. The wheel 1 of the ultrasonic welder shown in FIG. 1 is preferably of the type shown in FIGS. 7 and 8 in terms of welding strength and cutting performance. Incidentally, for the type of wheel 1 shown in FIG. 7, t ₁ =0.2 to 0.3 mm, θ ₁ =60°, and
The mold shown in FIG. 8 was tested with t ₂ =1 mm and θ ₂ =70° and was found to be a desirable mold in terms of welding strength and cutting properties. Example 1 Skiing a 3-layer stretchable waterproof fabric consisting of a 32 gauge warp knitted tricot using 70d nylon filament yarn, a 30 micron thick polyurethane film, and a pile circular knit fabric using 70d nylon filament yarn. After molding and cutting the pants,
The ultrasonic welder BU-3-111 (product of Brother Industries, Ltd.) is equipped with ultrasonic oscillation output welder wheel #970 (product of Brother Industries, Ltd.) as shown in Figure 7. Sound wave oscillation output 350W, 2.5
The third
Form the fused part 3 as shown in the figure, and use a zigzag stitch sewing machine (product of Tokyo Heavy Industries Co., Ltd.) to sew with polyester spun thread No. 50 (sewing thread count), stitch width 2.5 mm, and number of stitches. Staggered seams 4 as shown in FIG. 4 were formed by sewing with 21 stitches/3 cm. The seam strength was 52 kg/5 cm. Toray silicone is applied from the back side of this seam, that is, from the pile circular knitted fabric side.
When a silicone resin solution made by diluting PRX305 (a product of Toray Silicone Co., Ltd.) twice was applied, the waterproofness of this seam was excellent, with a water pressure resistance of 880 mmH ₂ O or more. In addition, the thickness of the seam part is 9th
The thickness was very thin compared to the conventional seam part shown in the figure, and was almost the same as the thickness of the non-stitched part, giving it a very good wearing feel. Furthermore, since the seam allowance can be eliminated, the amount of fabric can be saved by more than 3%. Example 2 A 2-way tricot knitted fabric made of 40d nylon filament yarn x spandex yarn (registered trademark, Opelon: Toray Dupont Co., Ltd.) 40d was coated with polyurethane resin, a 4 mm thick polyurethane foam was adhered, and then cotton It has a 4-layer structure with 2-way fabrics bonded together, and has an airflow rate of 50/m ² /
A sample for a wind tunnel experiment was sewn using a fabric (for ski jump competitions) that was controlled to have a speed of sec to 70/m ² /sec. Experimental samples (sewn products) were molded using a paper pattern drawn to fit a jump shape model, cut, and sewn under the conditions shown in Table 1.

[Table] That is, the fused part 3 as shown in Fig. 3 is formed by fusing and fusing with an ultrasonic welder welding machine, and the fused part 3 as shown in Fig. 4 is formed by sewing with a zigzag sewing machine to form the zigzag seam 4 as shown in Fig. 4. Formed. The seam strength was 48 kg/5 cm, which was not much different from the conventional method of 55 kg/5 cm. Also, looking at the seamed parts, there were no irregularities, as if it were made of a single piece of fabric, and it fit well to the model shape. On the other hand, when sewing with the conventional method, two seam allowances overlap at the seam portion (three overlap when folded), resulting in significant unevenness and poor fitting. Next, a wind tunnel experiment was conducted using the sewn sample on a jump-shaped model. In this experiment, the seams of the sewing samples were set in the length direction (armpit) of the model type and in the horizontal direction (belly). When wind at a speed of 40 m/sec is applied to the model type at different angles, the relationship between the angle of attack and the drag force is as shown in Table 2. In the conceivable angle of attack range of 25 to 40 degrees, the seams created by the method of the present invention have a smaller drag coefficient than those of the conventional method, making it possible to create clothing that extends flight distance.

〔Effect of the invention〕

As described above, the bonded fabric seam forming method of the present invention comprises a woven or knitted fabric mainly made of synthetic fibers and an elastic sheet-like material laminated thereon to have a multilayer structure of two or three or more layers. The method is characterized in that two sheets of bonded fabric are overlapped and cut, and at the same time the upper and lower fabrics are fused together, and then a seam is formed across the fabrics using the fused bonded portion as a boundary. Therefore, the seam-formed product obtained by the present invention can prevent water from entering between the fabrics by the fused portion, improve waterproofness, and further improve the water resistance between the fused portions. Since the seams are formed so as to span the fabrics, the seam strength is comparable to that of conventional seam-formed products, and it is possible to achieve excellent dimensional stability. In addition, since the seams are formed across fabrics with the fused parts as boundaries, there is almost no seam allowance, which eliminates loose seam allowances and reduces air resistance when used as competition ski wear, etc. be able to. In addition, since the seam allowance can be eliminated, fabric can be saved accordingly, and the thickness of the seam part can be made almost the same as the unstitched part, making it comfortable to wear. It can be done.

[Brief explanation of drawings]

Figures 1 and 2 show two sheets of bonded fabric stacked together and fusion-bonded at the same time as cutting. Figure 1 is a perspective view when an ultrasonic welder wheel is used; Figure 2 is a perspective view when a high-frequency welder blade is used, Figure 3 is a perspective view of the fusion-bonded bonded fabric in an expanded state, and Figures 4 to 6 show the boundaries of the fusion-bonded part. This indicates a state in which seams are formed so as to span bonded fabrics.
The figure is a perspective view with staggered seams formed, Figure 5 is a perspective view with flat seams formed, Figure 6 is a perspective view with rolled seams formed, and Figures 7A and B.
8 shows an ultrasonic welder wheel, A is a side view, B is a perspective view, FIG. 8 is a side view showing other examples of the ultrasonic welder wheel, FIGS. 9 and 1.
FIG. 0 is a perspective view illustrating a conventional seam structure. 1... Ultrasonic welder wheel, 2... High frequency welder blade, 3... Fusion part, 4... Staggered seam, 5... Flat seam, 6... Rolling seam,
Fa, Fb...bonded fabric.

Claims (1)

[Scope of Claims] 1. A bonded fabric having a multilayer structure of two or three or more layers, in which an elastic sheet-like material is laminated on a woven or knitted fabric mainly made of synthetic fibers,
A bonded fabric characterized in that two pieces of fabric are overlapped and cut, and at the same time, the upper and lower fabrics are fused and bonded together, and then a seam is formed so as to span the fabrics using the fused bonded portion as a boundary. seam formation method. 2. The method of forming seams in bonded fabric according to claim 1, characterized in that a waterproof tape is fixed onto the seams after or simultaneously with the formation of the seams. 3. Forming a seam in a bonded fabric according to claim 1 or 2, characterized in that after the seam is formed, a resin capable of adhering to both the fabric and the sewing thread is applied to the seam portion. Method.